PMO treatment of structure-reactivity relationships. Polar effects in the free radical addition reactions

1983 ◽  
Vol 48 (9) ◽  
pp. 2469-2472
Author(s):  
Robert Ponec ◽  
Milan Hájek ◽  
Jaroslav Málek
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Radical Addition ◽  
Experimental Results ◽  
Addition Reactions ◽  
Perturbation Approach ◽  
Electronic Nature ◽  
Free Radical Addition

The electronic nature of free radicals in the addition to substituted styrenes was studied by a simple perturbation approach utilizing delocalisability Dr as a static index of reactivity. In agreement with experimental results, the calculations reproduce correctly the change in the sign of the Hammett ρ constants in going from electronegative to electropositive radicals.

PMO-treatment of the structure-reactivity relationships in free radical addition reactions of cycloalkenes

1981 ◽  
Vol 46 (10) ◽  
pp. 2524-2530 ◽  
Author(s):  
Robert Ponec ◽  
Milan Hájek ◽  
Jaroslav Málek
Keyword(s):  
Free Radical ◽  
Radical Addition ◽  
Addition Reactions ◽  
Perturbation Approach ◽  
Ring Strain ◽  
Free Radical Addition ◽  
Acceptable Agreement

The effect of ring strain in molecules of C5-C8 cycloalkenes and that of electronegativity of the attacking radicals upon reactivity of cycloalkenes in 1,2 addition reactions was studied by using a simple perturbation approach. The trends of the experimentally determined reactivities of cycloalkenes towards CH3, CCl3, CF2CF2CF3, CH3CO, NCCHCO2H5, C2H5, C2H5S and Br radicals were found to be in an acceptable agreement with the trends of the calculated Fukui's delocalisabilities Dr. The reactivity of cycloalkenes appears to be influenced by I-strain in the cycloalkene molecules as well as by electronegativity of the attacking radicals.

Free radical addition reactions—IV

Tetrahedron ◽  
1965 ◽  
Vol 21 (10) ◽  
pp. 2743-2747 ◽  
Author(s):  
H. Goldwhite ◽  
M.S. Gibson ◽  
C. Harris
Keyword(s):  
Free Radical ◽  
Radical Addition ◽  
Addition Reactions ◽  
Free Radical Addition

ChemInform Abstract: Free Radical Addition Reactions of Allylic Sulfones to Alkenes.

ChemInform ◽  
2010 ◽  
Vol 28 (38) ◽  
pp. no-no
Author(s):  
I. W. HARVEY ◽  
E. D. PHILLIPS ◽  
G. H. WHITHAM
Keyword(s):  
Free Radical ◽  
Radical Addition ◽  
Addition Reactions ◽  
Free Radical Addition
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